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#
# Copyright (C) 2023 Soleta Networks <info@soleta.eu>
#
# This program is free software: you can redistribute it and/or modify it under
# the terms of the GNU Affero General Public License as published by the
# Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
import json
import logging
import os
import shlex
import subprocess
import shutil
from src.utils.disk import *
from src.utils.fs import *
from src.utils.probe import *
from src.log import OgError
import fdisk
EFIBOOTMGR_BIN='/opt/opengnsys/bin/efibootmgr'
def _find_bootentry(entries, label):
for entry in entries:
if entry['description'] == label:
return entry
else:
raise OgError('Boot entry {label} not found')
def _strip_boot_prefix(entry):
try:
num = entry['name'][4:]
except:
raise OgError('Unable to strip "Boot" prefix from boot entry')
return num
def _check_efibootmgr_json():
"""
Checks if efibootmgr --json option is supported.
Returns True if supported, False otherwise.
"""
supported = True
try:
subprocess.run([EFIBOOTMGR_BIN, '--json'], stdout=subprocess.DEVNULL,
stderr=subprocess.DEVNULL, check=True)
except subprocess.CalledProcessError:
supported = False
return supported
def is_uefi_supported():
return os.path.exists("/sys/firmware/efi")
def run_efibootmgr_json():
if _check_efibootmgr_json() is False:
raise OgError(f'{EFIBOOTMGR_BIN} not available')
proc = subprocess.run([EFIBOOTMGR_BIN, '--json'], capture_output=True, text=True)
dict_json = json.loads(proc.stdout)
return dict_json
def efibootmgr_bootnext(description):
logging.info(f'Setting BootNext to value from boot entry with label {description}')
bootnext_cmd = '{efibootmgr} -n {bootnum}'
boot_entries = run_efibootmgr_json().get('vars', [])
entry = _find_bootentry(boot_entries, description)
num = _strip_boot_prefix(entry) # efibootmgr output uses BootXXXX for each entry, remove the "Boot" prefix.
bootnext_cmd = bootnext_cmd.format(bootnum=num, efibootmgr=EFIBOOTMGR_BIN)
subprocess.run(shlex.split(bootnext_cmd), check=True,
stdout=subprocess.DEVNULL)
def efibootmgr_delete_bootentry(label):
dict_json = run_efibootmgr_json()
efibootmgr_cmd = '{efibootmgr} -q -b {bootnum} -B'
for entry in dict_json.get('vars', []):
if entry['description'] == label:
num = entry['name'][4:] # Remove "Boot" prefix to extract num
efibootmgr_cmd = efibootmgr_cmd.format(bootnum=num, efibootmgr=EFIBOOTMGR_BIN)
subprocess.run(shlex.split(efibootmgr_cmd), check=True)
break
else:
logging.info(f'Cannot delete boot entry {label} because it was not found.')
def efibootmgr_create_bootentry(disk, part, loader, label, add_to_bootorder=True):
entries = run_efibootmgr_json().get('vars', [])
create_opt = '-c' if add_to_bootorder else '-C'
index_opt = f'-I {len(entries)}' # Requires efibootmgr version 18
efibootmgr_cmd = f'{EFIBOOTMGR_BIN} {create_opt} {index_opt} -d {disk} -p {part} -L {label} -l {loader}'
logging.info(f'{EFIBOOTMGR_BIN} command creating boot entry: {efibootmgr_cmd}')
try:
proc = subprocess.run(shlex.split(efibootmgr_cmd), check=True, text=True)
except OSError as e:
raise OgError(f'Unexpected error adding boot entry to nvram. UEFI firmware might be buggy') from e
def _find_efi_loader(loader_paths):
for efi_app in loader_paths:
logging.info(f'Searching for {efi_app}')
if os.path.exists(efi_app):
logging.info(f'Found bootloader at ESP partition: {efi_app}')
return efi_app
else:
raise OgError(f'Unable to locate Windows EFI bootloader bootmgfw.efi')
def find_windows_efi_loader(esp_mountpoint, bootlabel):
loader_paths = [f'{esp_mountpoint}/EFI/{bootlabel}/Boot/bootmgfw.efi',
f'{esp_mountpoint}/EFI/Microsoft/Boot/bootmgfw.efi']
return _find_efi_loader(loader_paths)
def find_linux_efi_loader(esp_mountpoint, bootlabel):
loader_paths = [f'{esp_mountpoint}/EFI/{bootlabel}/Boot/shimx64.efi',
f'{esp_mountpoint}/EFI/ubuntu/shimx64.efi']
return _find_efi_loader(loader_paths)
def copy_windows_efi_bootloader(disk, partition):
device = get_partition_device(disk, partition)
mountpoint = device.replace('dev', 'mnt')
if not mount_mkdir(device, mountpoint):
raise OgError(f'Cannot probe OS family. Unable to mount {device} into {mountpoint}')
os_family = get_os_family(mountpoint)
is_uefi = is_uefi_supported()
if not is_uefi or os_family != OSFamily.WINDOWS:
return
bootlabel = f'Part-{disk:02d}-{partition:02d}'
esp, esp_disk, esp_part_number = get_efi_partition(disk, enforce_gpt=True)
esp_mountpoint = esp.replace('dev', 'mnt')
if not mount_mkdir(esp, esp_mountpoint):
umount(mountpoint)
raise OgError(f'Unable to mount detected EFI System Partition at {esp} into {esp_mountpoint}')
try:
loader = find_windows_efi_loader(esp_mountpoint, bootlabel)
loader_dir = os.path.dirname(loader)
destination_dir = f'{mountpoint}/ogBoot'
if os.path.exists(destination_dir):
try:
shutil.rmtree(destination_dir)
except OSError as e:
raise OgError(f'Failed to delete {destination_dir}: {e}') from e
logging.info(f'Copying {loader_dir} into {destination_dir}')
try:
shutil.copytree(loader_dir, destination_dir)
except OSError as e:
raise OgError(f'Failed to copy {loader_dir} into {destination_dir}: {e}') from e
finally:
umount(mountpoint)
umount(esp_mountpoint)
def restore_windows_efi_bootloader(disk, partition):
device = get_partition_device(disk, partition)
mountpoint = device.replace('dev', 'mnt')
if not mount_mkdir(device, mountpoint):
raise OgError(f'Cannot probe OS family. Unable to mount {device} into {mountpoint}')
bootlabel = f'Part-{disk:02d}-{partition:02d}'
esp, esp_disk, esp_part_number = get_efi_partition(disk, enforce_gpt=True)
esp_mountpoint = esp.replace('dev', 'mnt')
if not mount_mkdir(esp, esp_mountpoint):
umount(mountpoint)
raise OgError(f'Unable to mount detected EFI System Partition at {esp} into {esp_mountpoint}')
try:
loader_dir = f'{mountpoint}/ogBoot'
destination_dir = f'{esp_mountpoint}/EFI/{bootlabel}/Boot'
if os.path.exists(destination_dir):
try:
shutil.rmtree(destination_dir)
except OSError as e:
raise OgError(f'Failed to delete {destination_dir}: {e}') from e
logging.info(f'Copying {loader_dir} into {destination_dir}')
try:
shutil.copytree(loader_dir, destination_dir)
except OSError as e:
raise OgError(f'Failed to copy {loader_dir} into {destination_dir}: {e}') from e
finally:
umount(mountpoint)
umount(esp_mountpoint)
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